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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> * Copyright (c) 2009 Kathryn Huxtable and Kenneth Orr.</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> * This file is part of the SeaGlass Pluggable Look and Feel.</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> * Licensed under the Apache License, Version 2.0 (the "License");</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> * you may not use this file except in compliance with the License.</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> * You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> *     <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> * Unless required by applicable law or agreed to in writing, software</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> * distributed under the License is distributed on an "AS IS" BASIS,</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> * See the License for the specific language governing permissions and</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment"> * limitations under the License.</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="18" href="#18">18</a>  <em class="jxr_comment"> * $Id: DropShadowEffect.java 1115 2010-02-09 21:26:16Z kathryn@kathrynhuxtable.org $</em>
<a class="jxr_linenumber" name="19" href="#19">19</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">package</strong> com.seaglasslookandfeel.effect;
<a class="jxr_linenumber" name="21" href="#21">21</a>  
<a class="jxr_linenumber" name="22" href="#22">22</a>  <strong class="jxr_keyword">import</strong> java.awt.image.BufferedImage;
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.awt.image.Raster;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.awt.image.WritableRaster;
<a class="jxr_linenumber" name="25" href="#25">25</a>  
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.util.Arrays;
<a class="jxr_linenumber" name="27" href="#27">27</a>  
<a class="jxr_linenumber" name="28" href="#28">28</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="29" href="#29">29</a>  <em class="jxr_javadoccomment"> * DropShadowEffect - This effect currently only works with ARGB type buffered</em>
<a class="jxr_linenumber" name="30" href="#30">30</a>  <em class="jxr_javadoccomment"> * images.</em>
<a class="jxr_linenumber" name="31" href="#31">31</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="32" href="#32">32</a>  <em class="jxr_javadoccomment"> * &lt;p&gt;Copied from Nimbus's DropShadowEffect by Jasper Potts. This was package</em>
<a class="jxr_linenumber" name="33" href="#33">33</a>  <em class="jxr_javadoccomment"> * local.&lt;/p&gt;</em>
<a class="jxr_linenumber" name="34" href="#34">34</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../com/seaglasslookandfeel/effect/DropShadowEffect.html">DropShadowEffect</a> <strong class="jxr_keyword">extends</strong> <a href="../../../com/seaglasslookandfeel/effect/ShadowEffect.html">ShadowEffect</a> {
<a class="jxr_linenumber" name="36" href="#36">36</a>  
<a class="jxr_linenumber" name="37" href="#37">37</a>      <em class="jxr_comment">// =================================================================================================================</em>
<a class="jxr_linenumber" name="38" href="#38">38</a>      <em class="jxr_comment">// Effect Methods</em>
<a class="jxr_linenumber" name="39" href="#39">39</a>  
<a class="jxr_linenumber" name="40" href="#40">40</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment">     * Get the type of this effect, one of UNDER,BLENDED,OVER. UNDER means the</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment">     * result of apply effect should be painted under the src image. BLENDED</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment">     * means the result of apply sffect contains a modified src image so just it</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment">     * should be painted. OVER means the result of apply effect should be</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment">     * painted over the src image.</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment">     * @return The effect type</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>      @Override
<a class="jxr_linenumber" name="50" href="#50">50</a>      <strong class="jxr_keyword">public</strong> <a href="../../../com/seaglasslookandfeel/effect/Effect.html">EffectType</a> getEffectType() {
<a class="jxr_linenumber" name="51" href="#51">51</a>          <strong class="jxr_keyword">return</strong> EffectType.UNDER;
<a class="jxr_linenumber" name="52" href="#52">52</a>      }
<a class="jxr_linenumber" name="53" href="#53">53</a>  
<a class="jxr_linenumber" name="54" href="#54">54</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment">     * Apply the effect to the src image generating the result . The result</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>  <em class="jxr_javadoccomment">     * image may or may not contain the source image depending on what the</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>  <em class="jxr_javadoccomment">     * effect type is.</em>
<a class="jxr_linenumber" name="58" href="#58">58</a>  <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="59" href="#59">59</a>  <em class="jxr_javadoccomment">     * @param  src The source image for applying the effect to</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>  <em class="jxr_javadoccomment">     * @param  dst The destination image to paint effect result into. If this is</em>
<a class="jxr_linenumber" name="61" href="#61">61</a>  <em class="jxr_javadoccomment">     *             null then a new image will be created</em>
<a class="jxr_linenumber" name="62" href="#62">62</a>  <em class="jxr_javadoccomment">     * @param  w   The width of the src image to apply effect to, this allow the</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>  <em class="jxr_javadoccomment">     *             src and dst buffers to be bigger than the area the need</em>
<a class="jxr_linenumber" name="64" href="#64">64</a>  <em class="jxr_javadoccomment">     *             effect applied to it</em>
<a class="jxr_linenumber" name="65" href="#65">65</a>  <em class="jxr_javadoccomment">     * @param  h   The height of the src image to apply effect to, this allow</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>  <em class="jxr_javadoccomment">     *             the src and dst buffers to be bigger than the area the need</em>
<a class="jxr_linenumber" name="67" href="#67">67</a>  <em class="jxr_javadoccomment">     *             effect applied to it</em>
<a class="jxr_linenumber" name="68" href="#68">68</a>  <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="69" href="#69">69</a>  <em class="jxr_javadoccomment">     * @return Image with the result of the effect</em>
<a class="jxr_linenumber" name="70" href="#70">70</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="71" href="#71">71</a>      @Override
<a class="jxr_linenumber" name="72" href="#72">72</a>      <strong class="jxr_keyword">public</strong> BufferedImage applyEffect(BufferedImage src, BufferedImage dst, <strong class="jxr_keyword">int</strong> w, <strong class="jxr_keyword">int</strong> h) {
<a class="jxr_linenumber" name="73" href="#73">73</a>          <strong class="jxr_keyword">if</strong> (src == <strong class="jxr_keyword">null</strong> || (src.getType() != BufferedImage.TYPE_INT_ARGB &amp;&amp; src.getType() != BufferedImage.TYPE_INT_ARGB_PRE)) {
<a class="jxr_linenumber" name="74" href="#74">74</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"Effect only works with source images of type BufferedImage.TYPE_INT_ARGB. Type is "</span>
<a class="jxr_linenumber" name="75" href="#75">75</a>                                                 + src.getType());
<a class="jxr_linenumber" name="76" href="#76">76</a>          }
<a class="jxr_linenumber" name="77" href="#77">77</a>  
<a class="jxr_linenumber" name="78" href="#78">78</a>          <strong class="jxr_keyword">if</strong> (dst != <strong class="jxr_keyword">null</strong> &amp;&amp; dst.getType() != BufferedImage.TYPE_INT_ARGB) {
<a class="jxr_linenumber" name="79" href="#79">79</a>              <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException(<span class="jxr_string">"Effect only works with destination images of type BufferedImage.TYPE_INT_ARGB."</span>);
<a class="jxr_linenumber" name="80" href="#80">80</a>          }
<a class="jxr_linenumber" name="81" href="#81">81</a>  
<a class="jxr_linenumber" name="82" href="#82">82</a>          <em class="jxr_comment">// calculate offset</em>
<a class="jxr_linenumber" name="83" href="#83">83</a>          <strong class="jxr_keyword">double</strong> trangleAngle = Math.toRadians(angle - 90);
<a class="jxr_linenumber" name="84" href="#84">84</a>          <strong class="jxr_keyword">int</strong>    offsetX      = (<strong class="jxr_keyword">int</strong>) (Math.sin(trangleAngle) * distance + 0.5);
<a class="jxr_linenumber" name="85" href="#85">85</a>          <strong class="jxr_keyword">int</strong>    offsetY      = (<strong class="jxr_keyword">int</strong>) (Math.cos(trangleAngle) * distance + 0.5);
<a class="jxr_linenumber" name="86" href="#86">86</a>  
<a class="jxr_linenumber" name="87" href="#87">87</a>          <em class="jxr_comment">// calculate expanded size</em>
<a class="jxr_linenumber" name="88" href="#88">88</a>          <strong class="jxr_keyword">int</strong> tmpOffX = offsetX + size;
<a class="jxr_linenumber" name="89" href="#89">89</a>          <strong class="jxr_keyword">int</strong> tmpOffY = offsetX + size;
<a class="jxr_linenumber" name="90" href="#90">90</a>          <strong class="jxr_keyword">int</strong> tmpW    = w + offsetX + size + size;
<a class="jxr_linenumber" name="91" href="#91">91</a>          <strong class="jxr_keyword">int</strong> tmpH    = h + offsetX + size;
<a class="jxr_linenumber" name="92" href="#92">92</a>  
<a class="jxr_linenumber" name="93" href="#93">93</a>          <em class="jxr_comment">// create tmp buffers</em>
<a class="jxr_linenumber" name="94" href="#94">94</a>          <strong class="jxr_keyword">int</strong>[]  lineBuf = getArrayCache().getTmpIntArray(w);
<a class="jxr_linenumber" name="95" href="#95">95</a>          byte[] tmpBuf1 = getArrayCache().getTmpByteArray1(tmpW * tmpH);
<a class="jxr_linenumber" name="96" href="#96">96</a>  
<a class="jxr_linenumber" name="97" href="#97">97</a>          Arrays.fill(tmpBuf1, (byte) 0x00);
<a class="jxr_linenumber" name="98" href="#98">98</a>          byte[] tmpBuf2 = getArrayCache().getTmpByteArray2(tmpW * tmpH);
<a class="jxr_linenumber" name="99" href="#99">99</a>  
<a class="jxr_linenumber" name="100" href="#100">100</a>         <em class="jxr_comment">// extract src image alpha channel and inverse and offset</em>
<a class="jxr_linenumber" name="101" href="#101">101</a>         Raster srcRaster = src.getRaster();
<a class="jxr_linenumber" name="102" href="#102">102</a> 
<a class="jxr_linenumber" name="103" href="#103">103</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> y = 0; y &lt; h; y++) {
<a class="jxr_linenumber" name="104" href="#104">104</a>             <strong class="jxr_keyword">int</strong> dy     = (y + tmpOffY);
<a class="jxr_linenumber" name="105" href="#105">105</a>             <strong class="jxr_keyword">int</strong> offset = dy * tmpW;
<a class="jxr_linenumber" name="106" href="#106">106</a> 
<a class="jxr_linenumber" name="107" href="#107">107</a>             srcRaster.getDataElements(0, y, w, 1, lineBuf);
<a class="jxr_linenumber" name="108" href="#108">108</a> 
<a class="jxr_linenumber" name="109" href="#109">109</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> x = 0; x &lt; w; x++) {
<a class="jxr_linenumber" name="110" href="#110">110</a>                 <strong class="jxr_keyword">int</strong> dx = x + tmpOffX;
<a class="jxr_linenumber" name="111" href="#111">111</a> 
<a class="jxr_linenumber" name="112" href="#112">112</a>                 tmpBuf1[offset + dx] = (byte) ((lineBuf[x] &amp; 0xFF000000) &gt;&gt;&gt; 24);
<a class="jxr_linenumber" name="113" href="#113">113</a>             }
<a class="jxr_linenumber" name="114" href="#114">114</a>         }
<a class="jxr_linenumber" name="115" href="#115">115</a> 
<a class="jxr_linenumber" name="116" href="#116">116</a>         <em class="jxr_comment">// blur</em>
<a class="jxr_linenumber" name="117" href="#117">117</a>         <strong class="jxr_keyword">float</strong>[] kernel = EffectUtils.createGaussianKernel(size);
<a class="jxr_linenumber" name="118" href="#118">118</a> 
<a class="jxr_linenumber" name="119" href="#119">119</a>         EffectUtils.blur(tmpBuf1, tmpBuf2, tmpW, tmpH, kernel, size); <em class="jxr_comment">// horizontal</em>
<a class="jxr_linenumber" name="120" href="#120">120</a> 
<a class="jxr_linenumber" name="121" href="#121">121</a>         <em class="jxr_comment">// pass</em>
<a class="jxr_linenumber" name="122" href="#122">122</a>         EffectUtils.blur(tmpBuf2, tmpBuf1, tmpH, tmpW, kernel, size); <em class="jxr_comment">// vertical</em>
<a class="jxr_linenumber" name="123" href="#123">123</a> 
<a class="jxr_linenumber" name="124" href="#124">124</a>         <em class="jxr_comment">// pass</em>
<a class="jxr_linenumber" name="125" href="#125">125</a>         <em class="jxr_comment">// rescale</em>
<a class="jxr_linenumber" name="126" href="#126">126</a>         <strong class="jxr_keyword">float</strong> spread = Math.min(1 / (1 - (0.01f * <strong class="jxr_keyword">this</strong>.spread)), 255);
<a class="jxr_linenumber" name="127" href="#127">127</a> 
<a class="jxr_linenumber" name="128" href="#128">128</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> i = 0; i &lt; tmpBuf1.length; i++) {
<a class="jxr_linenumber" name="129" href="#129">129</a>             <strong class="jxr_keyword">int</strong> val = (<strong class="jxr_keyword">int</strong>) (((<strong class="jxr_keyword">int</strong>) tmpBuf1[i] &amp; 0xFF) * spread);
<a class="jxr_linenumber" name="130" href="#130">130</a> 
<a class="jxr_linenumber" name="131" href="#131">131</a>             tmpBuf1[i] = (val &gt; 255) ? (byte) 0xFF : (byte) val;
<a class="jxr_linenumber" name="132" href="#132">132</a>         }
<a class="jxr_linenumber" name="133" href="#133">133</a> 
<a class="jxr_linenumber" name="134" href="#134">134</a>         <em class="jxr_comment">// create color image with shadow color and greyscale image as alpha</em>
<a class="jxr_linenumber" name="135" href="#135">135</a>         <strong class="jxr_keyword">if</strong> (dst == <strong class="jxr_keyword">null</strong>)
<a class="jxr_linenumber" name="136" href="#136">136</a>             dst = <strong class="jxr_keyword">new</strong> BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
<a class="jxr_linenumber" name="137" href="#137">137</a> 
<a class="jxr_linenumber" name="138" href="#138">138</a>         WritableRaster shadowRaster = dst.getRaster();
<a class="jxr_linenumber" name="139" href="#139">139</a>         <strong class="jxr_keyword">int</strong>            red          = color.getRed();
<a class="jxr_linenumber" name="140" href="#140">140</a>         <strong class="jxr_keyword">int</strong>            green        = color.getGreen();
<a class="jxr_linenumber" name="141" href="#141">141</a>         <strong class="jxr_keyword">int</strong>            blue         = color.getBlue();
<a class="jxr_linenumber" name="142" href="#142">142</a> 
<a class="jxr_linenumber" name="143" href="#143">143</a>         <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> y = 0; y &lt; h; y++) {
<a class="jxr_linenumber" name="144" href="#144">144</a>             <strong class="jxr_keyword">int</strong> srcY         = y + tmpOffY;
<a class="jxr_linenumber" name="145" href="#145">145</a>             <strong class="jxr_keyword">int</strong> shadowOffset = (srcY - offsetY) * tmpW;
<a class="jxr_linenumber" name="146" href="#146">146</a> 
<a class="jxr_linenumber" name="147" href="#147">147</a>             <strong class="jxr_keyword">for</strong> (<strong class="jxr_keyword">int</strong> x = 0; x &lt; w; x++) {
<a class="jxr_linenumber" name="148" href="#148">148</a>                 <strong class="jxr_keyword">int</strong> srcX = x + tmpOffX;
<a class="jxr_linenumber" name="149" href="#149">149</a> 
<a class="jxr_linenumber" name="150" href="#150">150</a>                 lineBuf[x] = tmpBuf1[shadowOffset + (srcX - offsetX)] &lt;&lt; 24 | red &lt;&lt; 16 | green &lt;&lt; 8 | blue;
<a class="jxr_linenumber" name="151" href="#151">151</a>             }
<a class="jxr_linenumber" name="152" href="#152">152</a> 
<a class="jxr_linenumber" name="153" href="#153">153</a>             shadowRaster.setDataElements(0, y, w, 1, lineBuf);
<a class="jxr_linenumber" name="154" href="#154">154</a>         }
<a class="jxr_linenumber" name="155" href="#155">155</a> 
<a class="jxr_linenumber" name="156" href="#156">156</a>         <strong class="jxr_keyword">return</strong> dst;
<a class="jxr_linenumber" name="157" href="#157">157</a>     }
<a class="jxr_linenumber" name="158" href="#158">158</a> }
</pre>
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